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ACPI / util: cast data to u64 before shifting to fix sign extension
[deliverable/linux.git] / net / ipv6 / udp.c
1 /*
2 * UDP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/udp.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <linux/slab.h>
38 #include <asm/uaccess.h>
39
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/raw.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
47 #include <net/xfrm.h>
48 #include <net/inet6_hashtables.h>
49 #include <net/busy_poll.h>
50 #include <net/sock_reuseport.h>
51
52 #include <linux/proc_fs.h>
53 #include <linux/seq_file.h>
54 #include <trace/events/skb.h>
55 #include "udp_impl.h"
56
57 static u32 udp6_ehashfn(const struct net *net,
58 const struct in6_addr *laddr,
59 const u16 lport,
60 const struct in6_addr *faddr,
61 const __be16 fport)
62 {
63 static u32 udp6_ehash_secret __read_mostly;
64 static u32 udp_ipv6_hash_secret __read_mostly;
65
66 u32 lhash, fhash;
67
68 net_get_random_once(&udp6_ehash_secret,
69 sizeof(udp6_ehash_secret));
70 net_get_random_once(&udp_ipv6_hash_secret,
71 sizeof(udp_ipv6_hash_secret));
72
73 lhash = (__force u32)laddr->s6_addr32[3];
74 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
75
76 return __inet6_ehashfn(lhash, lport, fhash, fport,
77 udp_ipv6_hash_secret + net_hash_mix(net));
78 }
79
80 /* match_wildcard == true: IPV6_ADDR_ANY equals to any IPv6 addresses if IPv6
81 * only, and any IPv4 addresses if not IPv6 only
82 * match_wildcard == false: addresses must be exactly the same, i.e.
83 * IPV6_ADDR_ANY only equals to IPV6_ADDR_ANY,
84 * and 0.0.0.0 equals to 0.0.0.0 only
85 */
86 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
87 bool match_wildcard)
88 {
89 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
90 int sk2_ipv6only = inet_v6_ipv6only(sk2);
91 int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
92 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
93
94 /* if both are mapped, treat as IPv4 */
95 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) {
96 if (!sk2_ipv6only) {
97 if (sk->sk_rcv_saddr == sk2->sk_rcv_saddr)
98 return 1;
99 if (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr)
100 return match_wildcard;
101 }
102 return 0;
103 }
104
105 if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY)
106 return 1;
107
108 if (addr_type2 == IPV6_ADDR_ANY && match_wildcard &&
109 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
110 return 1;
111
112 if (addr_type == IPV6_ADDR_ANY && match_wildcard &&
113 !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED))
114 return 1;
115
116 if (sk2_rcv_saddr6 &&
117 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
118 return 1;
119
120 return 0;
121 }
122
123 static u32 udp6_portaddr_hash(const struct net *net,
124 const struct in6_addr *addr6,
125 unsigned int port)
126 {
127 unsigned int hash, mix = net_hash_mix(net);
128
129 if (ipv6_addr_any(addr6))
130 hash = jhash_1word(0, mix);
131 else if (ipv6_addr_v4mapped(addr6))
132 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
133 else
134 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
135
136 return hash ^ port;
137 }
138
139 int udp_v6_get_port(struct sock *sk, unsigned short snum)
140 {
141 unsigned int hash2_nulladdr =
142 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
143 unsigned int hash2_partial =
144 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
145
146 /* precompute partial secondary hash */
147 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
148 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
149 }
150
151 static void udp_v6_rehash(struct sock *sk)
152 {
153 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
154 &sk->sk_v6_rcv_saddr,
155 inet_sk(sk)->inet_num);
156
157 udp_lib_rehash(sk, new_hash);
158 }
159
160 static inline int compute_score(struct sock *sk, struct net *net,
161 unsigned short hnum,
162 const struct in6_addr *saddr, __be16 sport,
163 const struct in6_addr *daddr, __be16 dport,
164 int dif)
165 {
166 int score;
167 struct inet_sock *inet;
168
169 if (!net_eq(sock_net(sk), net) ||
170 udp_sk(sk)->udp_port_hash != hnum ||
171 sk->sk_family != PF_INET6)
172 return -1;
173
174 score = 0;
175 inet = inet_sk(sk);
176
177 if (inet->inet_dport) {
178 if (inet->inet_dport != sport)
179 return -1;
180 score++;
181 }
182
183 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
184 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
185 return -1;
186 score++;
187 }
188
189 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
190 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
191 return -1;
192 score++;
193 }
194
195 if (sk->sk_bound_dev_if) {
196 if (sk->sk_bound_dev_if != dif)
197 return -1;
198 score++;
199 }
200
201 if (sk->sk_incoming_cpu == raw_smp_processor_id())
202 score++;
203
204 return score;
205 }
206
207 static inline int compute_score2(struct sock *sk, struct net *net,
208 const struct in6_addr *saddr, __be16 sport,
209 const struct in6_addr *daddr,
210 unsigned short hnum, int dif)
211 {
212 int score;
213 struct inet_sock *inet;
214
215 if (!net_eq(sock_net(sk), net) ||
216 udp_sk(sk)->udp_port_hash != hnum ||
217 sk->sk_family != PF_INET6)
218 return -1;
219
220 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
221 return -1;
222
223 score = 0;
224 inet = inet_sk(sk);
225
226 if (inet->inet_dport) {
227 if (inet->inet_dport != sport)
228 return -1;
229 score++;
230 }
231
232 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
233 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
234 return -1;
235 score++;
236 }
237
238 if (sk->sk_bound_dev_if) {
239 if (sk->sk_bound_dev_if != dif)
240 return -1;
241 score++;
242 }
243
244 if (sk->sk_incoming_cpu == raw_smp_processor_id())
245 score++;
246
247 return score;
248 }
249
250 /* called with read_rcu_lock() */
251 static struct sock *udp6_lib_lookup2(struct net *net,
252 const struct in6_addr *saddr, __be16 sport,
253 const struct in6_addr *daddr, unsigned int hnum, int dif,
254 struct udp_hslot *hslot2, unsigned int slot2,
255 struct sk_buff *skb)
256 {
257 struct sock *sk, *result;
258 struct hlist_nulls_node *node;
259 int score, badness, matches = 0, reuseport = 0;
260 bool select_ok = true;
261 u32 hash = 0;
262
263 begin:
264 result = NULL;
265 badness = -1;
266 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
267 score = compute_score2(sk, net, saddr, sport,
268 daddr, hnum, dif);
269 if (score > badness) {
270 result = sk;
271 badness = score;
272 reuseport = sk->sk_reuseport;
273 if (reuseport) {
274 hash = udp6_ehashfn(net, daddr, hnum,
275 saddr, sport);
276 if (select_ok) {
277 struct sock *sk2;
278
279 sk2 = reuseport_select_sock(sk, hash, skb,
280 sizeof(struct udphdr));
281 if (sk2) {
282 result = sk2;
283 select_ok = false;
284 goto found;
285 }
286 }
287 matches = 1;
288 }
289 } else if (score == badness && reuseport) {
290 matches++;
291 if (reciprocal_scale(hash, matches) == 0)
292 result = sk;
293 hash = next_pseudo_random32(hash);
294 }
295 }
296 /*
297 * if the nulls value we got at the end of this lookup is
298 * not the expected one, we must restart lookup.
299 * We probably met an item that was moved to another chain.
300 */
301 if (get_nulls_value(node) != slot2)
302 goto begin;
303
304 if (result) {
305 found:
306 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
307 result = NULL;
308 else if (unlikely(compute_score2(result, net, saddr, sport,
309 daddr, hnum, dif) < badness)) {
310 sock_put(result);
311 goto begin;
312 }
313 }
314 return result;
315 }
316
317 struct sock *__udp6_lib_lookup(struct net *net,
318 const struct in6_addr *saddr, __be16 sport,
319 const struct in6_addr *daddr, __be16 dport,
320 int dif, struct udp_table *udptable,
321 struct sk_buff *skb)
322 {
323 struct sock *sk, *result;
324 struct hlist_nulls_node *node;
325 unsigned short hnum = ntohs(dport);
326 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
327 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
328 int score, badness, matches = 0, reuseport = 0;
329 bool select_ok = true;
330 u32 hash = 0;
331
332 rcu_read_lock();
333 if (hslot->count > 10) {
334 hash2 = udp6_portaddr_hash(net, daddr, hnum);
335 slot2 = hash2 & udptable->mask;
336 hslot2 = &udptable->hash2[slot2];
337 if (hslot->count < hslot2->count)
338 goto begin;
339
340 result = udp6_lib_lookup2(net, saddr, sport,
341 daddr, hnum, dif,
342 hslot2, slot2, skb);
343 if (!result) {
344 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
345 slot2 = hash2 & udptable->mask;
346 hslot2 = &udptable->hash2[slot2];
347 if (hslot->count < hslot2->count)
348 goto begin;
349
350 result = udp6_lib_lookup2(net, saddr, sport,
351 &in6addr_any, hnum, dif,
352 hslot2, slot2, skb);
353 }
354 rcu_read_unlock();
355 return result;
356 }
357 begin:
358 result = NULL;
359 badness = -1;
360 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
361 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
362 if (score > badness) {
363 result = sk;
364 badness = score;
365 reuseport = sk->sk_reuseport;
366 if (reuseport) {
367 hash = udp6_ehashfn(net, daddr, hnum,
368 saddr, sport);
369 if (select_ok) {
370 struct sock *sk2;
371
372 sk2 = reuseport_select_sock(sk, hash, skb,
373 sizeof(struct udphdr));
374 if (sk2) {
375 result = sk2;
376 select_ok = false;
377 goto found;
378 }
379 }
380 matches = 1;
381 }
382 } else if (score == badness && reuseport) {
383 matches++;
384 if (reciprocal_scale(hash, matches) == 0)
385 result = sk;
386 hash = next_pseudo_random32(hash);
387 }
388 }
389 /*
390 * if the nulls value we got at the end of this lookup is
391 * not the expected one, we must restart lookup.
392 * We probably met an item that was moved to another chain.
393 */
394 if (get_nulls_value(node) != slot)
395 goto begin;
396
397 if (result) {
398 found:
399 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
400 result = NULL;
401 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
402 daddr, dport, dif) < badness)) {
403 sock_put(result);
404 goto begin;
405 }
406 }
407 rcu_read_unlock();
408 return result;
409 }
410 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
411
412 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
413 __be16 sport, __be16 dport,
414 struct udp_table *udptable)
415 {
416 struct sock *sk;
417 const struct ipv6hdr *iph = ipv6_hdr(skb);
418
419 sk = skb_steal_sock(skb);
420 if (unlikely(sk))
421 return sk;
422 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
423 &iph->daddr, dport, inet6_iif(skb),
424 udptable, skb);
425 }
426
427 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
428 const struct in6_addr *daddr, __be16 dport, int dif)
429 {
430 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table, NULL);
431 }
432 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
433
434 /*
435 * This should be easy, if there is something there we
436 * return it, otherwise we block.
437 */
438
439 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
440 int noblock, int flags, int *addr_len)
441 {
442 struct ipv6_pinfo *np = inet6_sk(sk);
443 struct inet_sock *inet = inet_sk(sk);
444 struct sk_buff *skb;
445 unsigned int ulen, copied;
446 int peeked, off = 0;
447 int err;
448 int is_udplite = IS_UDPLITE(sk);
449 bool checksum_valid = false;
450 int is_udp4;
451 bool slow;
452
453 if (flags & MSG_ERRQUEUE)
454 return ipv6_recv_error(sk, msg, len, addr_len);
455
456 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
457 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
458
459 try_again:
460 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
461 &peeked, &off, &err);
462 if (!skb)
463 goto out;
464
465 ulen = skb->len - sizeof(struct udphdr);
466 copied = len;
467 if (copied > ulen)
468 copied = ulen;
469 else if (copied < ulen)
470 msg->msg_flags |= MSG_TRUNC;
471
472 is_udp4 = (skb->protocol == htons(ETH_P_IP));
473
474 /*
475 * If checksum is needed at all, try to do it while copying the
476 * data. If the data is truncated, or if we only want a partial
477 * coverage checksum (UDP-Lite), do it before the copy.
478 */
479
480 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
481 checksum_valid = !udp_lib_checksum_complete(skb);
482 if (!checksum_valid)
483 goto csum_copy_err;
484 }
485
486 if (checksum_valid || skb_csum_unnecessary(skb))
487 err = skb_copy_datagram_msg(skb, sizeof(struct udphdr),
488 msg, copied);
489 else {
490 err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg);
491 if (err == -EINVAL)
492 goto csum_copy_err;
493 }
494 if (unlikely(err)) {
495 trace_kfree_skb(skb, udpv6_recvmsg);
496 if (!peeked) {
497 atomic_inc(&sk->sk_drops);
498 if (is_udp4)
499 UDP_INC_STATS_USER(sock_net(sk),
500 UDP_MIB_INERRORS,
501 is_udplite);
502 else
503 UDP6_INC_STATS_USER(sock_net(sk),
504 UDP_MIB_INERRORS,
505 is_udplite);
506 }
507 goto out_free;
508 }
509 if (!peeked) {
510 if (is_udp4)
511 UDP_INC_STATS_USER(sock_net(sk),
512 UDP_MIB_INDATAGRAMS, is_udplite);
513 else
514 UDP6_INC_STATS_USER(sock_net(sk),
515 UDP_MIB_INDATAGRAMS, is_udplite);
516 }
517
518 sock_recv_ts_and_drops(msg, sk, skb);
519
520 /* Copy the address. */
521 if (msg->msg_name) {
522 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
523 sin6->sin6_family = AF_INET6;
524 sin6->sin6_port = udp_hdr(skb)->source;
525 sin6->sin6_flowinfo = 0;
526
527 if (is_udp4) {
528 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
529 &sin6->sin6_addr);
530 sin6->sin6_scope_id = 0;
531 } else {
532 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
533 sin6->sin6_scope_id =
534 ipv6_iface_scope_id(&sin6->sin6_addr,
535 inet6_iif(skb));
536 }
537 *addr_len = sizeof(*sin6);
538 }
539
540 if (np->rxopt.all)
541 ip6_datagram_recv_common_ctl(sk, msg, skb);
542
543 if (is_udp4) {
544 if (inet->cmsg_flags)
545 ip_cmsg_recv(msg, skb);
546 } else {
547 if (np->rxopt.all)
548 ip6_datagram_recv_specific_ctl(sk, msg, skb);
549 }
550
551 err = copied;
552 if (flags & MSG_TRUNC)
553 err = ulen;
554
555 out_free:
556 skb_free_datagram_locked(sk, skb);
557 out:
558 return err;
559
560 csum_copy_err:
561 slow = lock_sock_fast(sk);
562 if (!skb_kill_datagram(sk, skb, flags)) {
563 if (is_udp4) {
564 UDP_INC_STATS_USER(sock_net(sk),
565 UDP_MIB_CSUMERRORS, is_udplite);
566 UDP_INC_STATS_USER(sock_net(sk),
567 UDP_MIB_INERRORS, is_udplite);
568 } else {
569 UDP6_INC_STATS_USER(sock_net(sk),
570 UDP_MIB_CSUMERRORS, is_udplite);
571 UDP6_INC_STATS_USER(sock_net(sk),
572 UDP_MIB_INERRORS, is_udplite);
573 }
574 }
575 unlock_sock_fast(sk, slow);
576
577 /* starting over for a new packet, but check if we need to yield */
578 cond_resched();
579 msg->msg_flags &= ~MSG_TRUNC;
580 goto try_again;
581 }
582
583 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
584 u8 type, u8 code, int offset, __be32 info,
585 struct udp_table *udptable)
586 {
587 struct ipv6_pinfo *np;
588 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
589 const struct in6_addr *saddr = &hdr->saddr;
590 const struct in6_addr *daddr = &hdr->daddr;
591 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
592 struct sock *sk;
593 int err;
594 struct net *net = dev_net(skb->dev);
595
596 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
597 inet6_iif(skb), udptable, skb);
598 if (!sk) {
599 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
600 ICMP6_MIB_INERRORS);
601 return;
602 }
603
604 if (type == ICMPV6_PKT_TOOBIG) {
605 if (!ip6_sk_accept_pmtu(sk))
606 goto out;
607 ip6_sk_update_pmtu(skb, sk, info);
608 }
609 if (type == NDISC_REDIRECT) {
610 ip6_sk_redirect(skb, sk);
611 goto out;
612 }
613
614 np = inet6_sk(sk);
615
616 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
617 goto out;
618
619 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
620 goto out;
621
622 if (np->recverr)
623 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
624
625 sk->sk_err = err;
626 sk->sk_error_report(sk);
627 out:
628 sock_put(sk);
629 }
630
631 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
632 {
633 int rc;
634
635 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
636 sock_rps_save_rxhash(sk, skb);
637 sk_mark_napi_id(sk, skb);
638 sk_incoming_cpu_update(sk);
639 }
640
641 rc = sock_queue_rcv_skb(sk, skb);
642 if (rc < 0) {
643 int is_udplite = IS_UDPLITE(sk);
644
645 /* Note that an ENOMEM error is charged twice */
646 if (rc == -ENOMEM)
647 UDP6_INC_STATS_BH(sock_net(sk),
648 UDP_MIB_RCVBUFERRORS, is_udplite);
649 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
650 kfree_skb(skb);
651 return -1;
652 }
653 return 0;
654 }
655
656 static __inline__ void udpv6_err(struct sk_buff *skb,
657 struct inet6_skb_parm *opt, u8 type,
658 u8 code, int offset, __be32 info)
659 {
660 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
661 }
662
663 static struct static_key udpv6_encap_needed __read_mostly;
664 void udpv6_encap_enable(void)
665 {
666 if (!static_key_enabled(&udpv6_encap_needed))
667 static_key_slow_inc(&udpv6_encap_needed);
668 }
669 EXPORT_SYMBOL(udpv6_encap_enable);
670
671 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
672 {
673 struct udp_sock *up = udp_sk(sk);
674 int rc;
675 int is_udplite = IS_UDPLITE(sk);
676
677 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
678 goto drop;
679
680 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
681 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
682
683 /*
684 * This is an encapsulation socket so pass the skb to
685 * the socket's udp_encap_rcv() hook. Otherwise, just
686 * fall through and pass this up the UDP socket.
687 * up->encap_rcv() returns the following value:
688 * =0 if skb was successfully passed to the encap
689 * handler or was discarded by it.
690 * >0 if skb should be passed on to UDP.
691 * <0 if skb should be resubmitted as proto -N
692 */
693
694 /* if we're overly short, let UDP handle it */
695 encap_rcv = ACCESS_ONCE(up->encap_rcv);
696 if (skb->len > sizeof(struct udphdr) && encap_rcv) {
697 int ret;
698
699 /* Verify checksum before giving to encap */
700 if (udp_lib_checksum_complete(skb))
701 goto csum_error;
702
703 ret = encap_rcv(sk, skb);
704 if (ret <= 0) {
705 UDP_INC_STATS_BH(sock_net(sk),
706 UDP_MIB_INDATAGRAMS,
707 is_udplite);
708 return -ret;
709 }
710 }
711
712 /* FALLTHROUGH -- it's a UDP Packet */
713 }
714
715 /*
716 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
717 */
718 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
719
720 if (up->pcrlen == 0) { /* full coverage was set */
721 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
722 UDP_SKB_CB(skb)->cscov, skb->len);
723 goto drop;
724 }
725 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
726 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
727 UDP_SKB_CB(skb)->cscov, up->pcrlen);
728 goto drop;
729 }
730 }
731
732 if (rcu_access_pointer(sk->sk_filter)) {
733 if (udp_lib_checksum_complete(skb))
734 goto csum_error;
735 }
736
737 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
738 UDP6_INC_STATS_BH(sock_net(sk),
739 UDP_MIB_RCVBUFERRORS, is_udplite);
740 goto drop;
741 }
742
743 skb_dst_drop(skb);
744
745 bh_lock_sock(sk);
746 rc = 0;
747 if (!sock_owned_by_user(sk))
748 rc = __udpv6_queue_rcv_skb(sk, skb);
749 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
750 bh_unlock_sock(sk);
751 goto drop;
752 }
753 bh_unlock_sock(sk);
754
755 return rc;
756
757 csum_error:
758 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
759 drop:
760 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
761 atomic_inc(&sk->sk_drops);
762 kfree_skb(skb);
763 return -1;
764 }
765
766 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
767 __be16 loc_port, const struct in6_addr *loc_addr,
768 __be16 rmt_port, const struct in6_addr *rmt_addr,
769 int dif, unsigned short hnum)
770 {
771 struct inet_sock *inet = inet_sk(sk);
772
773 if (!net_eq(sock_net(sk), net))
774 return false;
775
776 if (udp_sk(sk)->udp_port_hash != hnum ||
777 sk->sk_family != PF_INET6 ||
778 (inet->inet_dport && inet->inet_dport != rmt_port) ||
779 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
780 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
781 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
782 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
783 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
784 return false;
785 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
786 return false;
787 return true;
788 }
789
790 static void flush_stack(struct sock **stack, unsigned int count,
791 struct sk_buff *skb, unsigned int final)
792 {
793 struct sk_buff *skb1 = NULL;
794 struct sock *sk;
795 unsigned int i;
796
797 for (i = 0; i < count; i++) {
798 sk = stack[i];
799 if (likely(!skb1))
800 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
801 if (!skb1) {
802 atomic_inc(&sk->sk_drops);
803 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
804 IS_UDPLITE(sk));
805 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
806 IS_UDPLITE(sk));
807 }
808
809 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
810 skb1 = NULL;
811 sock_put(sk);
812 }
813 if (unlikely(skb1))
814 kfree_skb(skb1);
815 }
816
817 static void udp6_csum_zero_error(struct sk_buff *skb)
818 {
819 /* RFC 2460 section 8.1 says that we SHOULD log
820 * this error. Well, it is reasonable.
821 */
822 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
823 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
824 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
825 }
826
827 /*
828 * Note: called only from the BH handler context,
829 * so we don't need to lock the hashes.
830 */
831 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
832 const struct in6_addr *saddr, const struct in6_addr *daddr,
833 struct udp_table *udptable, int proto)
834 {
835 struct sock *sk, *stack[256 / sizeof(struct sock *)];
836 const struct udphdr *uh = udp_hdr(skb);
837 struct hlist_nulls_node *node;
838 unsigned short hnum = ntohs(uh->dest);
839 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
840 int dif = inet6_iif(skb);
841 unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
842 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
843 bool inner_flushed = false;
844
845 if (use_hash2) {
846 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
847 udp_table.mask;
848 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
849 start_lookup:
850 hslot = &udp_table.hash2[hash2];
851 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
852 }
853
854 spin_lock(&hslot->lock);
855 sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
856 if (__udp_v6_is_mcast_sock(net, sk,
857 uh->dest, daddr,
858 uh->source, saddr,
859 dif, hnum) &&
860 /* If zero checksum and no_check is not on for
861 * the socket then skip it.
862 */
863 (uh->check || udp_sk(sk)->no_check6_rx)) {
864 if (unlikely(count == ARRAY_SIZE(stack))) {
865 flush_stack(stack, count, skb, ~0);
866 inner_flushed = true;
867 count = 0;
868 }
869 stack[count++] = sk;
870 sock_hold(sk);
871 }
872 }
873
874 spin_unlock(&hslot->lock);
875
876 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
877 if (use_hash2 && hash2 != hash2_any) {
878 hash2 = hash2_any;
879 goto start_lookup;
880 }
881
882 if (count) {
883 flush_stack(stack, count, skb, count - 1);
884 } else {
885 if (!inner_flushed)
886 UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
887 proto == IPPROTO_UDPLITE);
888 consume_skb(skb);
889 }
890 return 0;
891 }
892
893 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
894 int proto)
895 {
896 struct net *net = dev_net(skb->dev);
897 struct sock *sk;
898 struct udphdr *uh;
899 const struct in6_addr *saddr, *daddr;
900 u32 ulen = 0;
901
902 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
903 goto discard;
904
905 saddr = &ipv6_hdr(skb)->saddr;
906 daddr = &ipv6_hdr(skb)->daddr;
907 uh = udp_hdr(skb);
908
909 ulen = ntohs(uh->len);
910 if (ulen > skb->len)
911 goto short_packet;
912
913 if (proto == IPPROTO_UDP) {
914 /* UDP validates ulen. */
915
916 /* Check for jumbo payload */
917 if (ulen == 0)
918 ulen = skb->len;
919
920 if (ulen < sizeof(*uh))
921 goto short_packet;
922
923 if (ulen < skb->len) {
924 if (pskb_trim_rcsum(skb, ulen))
925 goto short_packet;
926 saddr = &ipv6_hdr(skb)->saddr;
927 daddr = &ipv6_hdr(skb)->daddr;
928 uh = udp_hdr(skb);
929 }
930 }
931
932 if (udp6_csum_init(skb, uh, proto))
933 goto csum_error;
934
935 /*
936 * Multicast receive code
937 */
938 if (ipv6_addr_is_multicast(daddr))
939 return __udp6_lib_mcast_deliver(net, skb,
940 saddr, daddr, udptable, proto);
941
942 /* Unicast */
943
944 /*
945 * check socket cache ... must talk to Alan about his plans
946 * for sock caches... i'll skip this for now.
947 */
948 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
949 if (sk) {
950 int ret;
951
952 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
953 sock_put(sk);
954 udp6_csum_zero_error(skb);
955 goto csum_error;
956 }
957
958 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
959 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
960 ip6_compute_pseudo);
961
962 ret = udpv6_queue_rcv_skb(sk, skb);
963 sock_put(sk);
964
965 /* a return value > 0 means to resubmit the input, but
966 * it wants the return to be -protocol, or 0
967 */
968 if (ret > 0)
969 return -ret;
970
971 return 0;
972 }
973
974 if (!uh->check) {
975 udp6_csum_zero_error(skb);
976 goto csum_error;
977 }
978
979 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
980 goto discard;
981
982 if (udp_lib_checksum_complete(skb))
983 goto csum_error;
984
985 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
986 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
987
988 kfree_skb(skb);
989 return 0;
990
991 short_packet:
992 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
993 proto == IPPROTO_UDPLITE ? "-Lite" : "",
994 saddr, ntohs(uh->source),
995 ulen, skb->len,
996 daddr, ntohs(uh->dest));
997 goto discard;
998 csum_error:
999 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
1000 discard:
1001 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
1002 kfree_skb(skb);
1003 return 0;
1004 }
1005
1006 static __inline__ int udpv6_rcv(struct sk_buff *skb)
1007 {
1008 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
1009 }
1010
1011 /*
1012 * Throw away all pending data and cancel the corking. Socket is locked.
1013 */
1014 static void udp_v6_flush_pending_frames(struct sock *sk)
1015 {
1016 struct udp_sock *up = udp_sk(sk);
1017
1018 if (up->pending == AF_INET)
1019 udp_flush_pending_frames(sk);
1020 else if (up->pending) {
1021 up->len = 0;
1022 up->pending = 0;
1023 ip6_flush_pending_frames(sk);
1024 }
1025 }
1026
1027 /**
1028 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
1029 * @sk: socket we are sending on
1030 * @skb: sk_buff containing the filled-in UDP header
1031 * (checksum field must be zeroed out)
1032 */
1033 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
1034 const struct in6_addr *saddr,
1035 const struct in6_addr *daddr, int len)
1036 {
1037 unsigned int offset;
1038 struct udphdr *uh = udp_hdr(skb);
1039 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
1040 __wsum csum = 0;
1041
1042 if (!frags) {
1043 /* Only one fragment on the socket. */
1044 skb->csum_start = skb_transport_header(skb) - skb->head;
1045 skb->csum_offset = offsetof(struct udphdr, check);
1046 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1047 } else {
1048 /*
1049 * HW-checksum won't work as there are two or more
1050 * fragments on the socket so that all csums of sk_buffs
1051 * should be together
1052 */
1053 offset = skb_transport_offset(skb);
1054 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1055
1056 skb->ip_summed = CHECKSUM_NONE;
1057
1058 do {
1059 csum = csum_add(csum, frags->csum);
1060 } while ((frags = frags->next));
1061
1062 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1063 csum);
1064 if (uh->check == 0)
1065 uh->check = CSUM_MANGLED_0;
1066 }
1067 }
1068
1069 /*
1070 * Sending
1071 */
1072
1073 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
1074 {
1075 struct sock *sk = skb->sk;
1076 struct udphdr *uh;
1077 int err = 0;
1078 int is_udplite = IS_UDPLITE(sk);
1079 __wsum csum = 0;
1080 int offset = skb_transport_offset(skb);
1081 int len = skb->len - offset;
1082
1083 /*
1084 * Create a UDP header
1085 */
1086 uh = udp_hdr(skb);
1087 uh->source = fl6->fl6_sport;
1088 uh->dest = fl6->fl6_dport;
1089 uh->len = htons(len);
1090 uh->check = 0;
1091
1092 if (is_udplite)
1093 csum = udplite_csum(skb);
1094 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
1095 skb->ip_summed = CHECKSUM_NONE;
1096 goto send;
1097 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1098 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1099 goto send;
1100 } else
1101 csum = udp_csum(skb);
1102
1103 /* add protocol-dependent pseudo-header */
1104 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1105 len, fl6->flowi6_proto, csum);
1106 if (uh->check == 0)
1107 uh->check = CSUM_MANGLED_0;
1108
1109 send:
1110 err = ip6_send_skb(skb);
1111 if (err) {
1112 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1113 UDP6_INC_STATS_USER(sock_net(sk),
1114 UDP_MIB_SNDBUFERRORS, is_udplite);
1115 err = 0;
1116 }
1117 } else
1118 UDP6_INC_STATS_USER(sock_net(sk),
1119 UDP_MIB_OUTDATAGRAMS, is_udplite);
1120 return err;
1121 }
1122
1123 static int udp_v6_push_pending_frames(struct sock *sk)
1124 {
1125 struct sk_buff *skb;
1126 struct udp_sock *up = udp_sk(sk);
1127 struct flowi6 fl6;
1128 int err = 0;
1129
1130 if (up->pending == AF_INET)
1131 return udp_push_pending_frames(sk);
1132
1133 /* ip6_finish_skb will release the cork, so make a copy of
1134 * fl6 here.
1135 */
1136 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1137
1138 skb = ip6_finish_skb(sk);
1139 if (!skb)
1140 goto out;
1141
1142 err = udp_v6_send_skb(skb, &fl6);
1143
1144 out:
1145 up->len = 0;
1146 up->pending = 0;
1147 return err;
1148 }
1149
1150 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1151 {
1152 struct ipv6_txoptions opt_space;
1153 struct udp_sock *up = udp_sk(sk);
1154 struct inet_sock *inet = inet_sk(sk);
1155 struct ipv6_pinfo *np = inet6_sk(sk);
1156 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1157 struct in6_addr *daddr, *final_p, final;
1158 struct ipv6_txoptions *opt = NULL;
1159 struct ipv6_txoptions *opt_to_free = NULL;
1160 struct ip6_flowlabel *flowlabel = NULL;
1161 struct flowi6 fl6;
1162 struct dst_entry *dst;
1163 int addr_len = msg->msg_namelen;
1164 int ulen = len;
1165 int hlimit = -1;
1166 int tclass = -1;
1167 int dontfrag = -1;
1168 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1169 int err;
1170 int connected = 0;
1171 int is_udplite = IS_UDPLITE(sk);
1172 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1173
1174 /* destination address check */
1175 if (sin6) {
1176 if (addr_len < offsetof(struct sockaddr, sa_data))
1177 return -EINVAL;
1178
1179 switch (sin6->sin6_family) {
1180 case AF_INET6:
1181 if (addr_len < SIN6_LEN_RFC2133)
1182 return -EINVAL;
1183 daddr = &sin6->sin6_addr;
1184 break;
1185 case AF_INET:
1186 goto do_udp_sendmsg;
1187 case AF_UNSPEC:
1188 msg->msg_name = sin6 = NULL;
1189 msg->msg_namelen = addr_len = 0;
1190 daddr = NULL;
1191 break;
1192 default:
1193 return -EINVAL;
1194 }
1195 } else if (!up->pending) {
1196 if (sk->sk_state != TCP_ESTABLISHED)
1197 return -EDESTADDRREQ;
1198 daddr = &sk->sk_v6_daddr;
1199 } else
1200 daddr = NULL;
1201
1202 if (daddr) {
1203 if (ipv6_addr_v4mapped(daddr)) {
1204 struct sockaddr_in sin;
1205 sin.sin_family = AF_INET;
1206 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1207 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1208 msg->msg_name = &sin;
1209 msg->msg_namelen = sizeof(sin);
1210 do_udp_sendmsg:
1211 if (__ipv6_only_sock(sk))
1212 return -ENETUNREACH;
1213 return udp_sendmsg(sk, msg, len);
1214 }
1215 }
1216
1217 if (up->pending == AF_INET)
1218 return udp_sendmsg(sk, msg, len);
1219
1220 /* Rough check on arithmetic overflow,
1221 better check is made in ip6_append_data().
1222 */
1223 if (len > INT_MAX - sizeof(struct udphdr))
1224 return -EMSGSIZE;
1225
1226 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1227 if (up->pending) {
1228 /*
1229 * There are pending frames.
1230 * The socket lock must be held while it's corked.
1231 */
1232 lock_sock(sk);
1233 if (likely(up->pending)) {
1234 if (unlikely(up->pending != AF_INET6)) {
1235 release_sock(sk);
1236 return -EAFNOSUPPORT;
1237 }
1238 dst = NULL;
1239 goto do_append_data;
1240 }
1241 release_sock(sk);
1242 }
1243 ulen += sizeof(struct udphdr);
1244
1245 memset(&fl6, 0, sizeof(fl6));
1246
1247 if (sin6) {
1248 if (sin6->sin6_port == 0)
1249 return -EINVAL;
1250
1251 fl6.fl6_dport = sin6->sin6_port;
1252 daddr = &sin6->sin6_addr;
1253
1254 if (np->sndflow) {
1255 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1256 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1257 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1258 if (!flowlabel)
1259 return -EINVAL;
1260 }
1261 }
1262
1263 /*
1264 * Otherwise it will be difficult to maintain
1265 * sk->sk_dst_cache.
1266 */
1267 if (sk->sk_state == TCP_ESTABLISHED &&
1268 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1269 daddr = &sk->sk_v6_daddr;
1270
1271 if (addr_len >= sizeof(struct sockaddr_in6) &&
1272 sin6->sin6_scope_id &&
1273 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1274 fl6.flowi6_oif = sin6->sin6_scope_id;
1275 } else {
1276 if (sk->sk_state != TCP_ESTABLISHED)
1277 return -EDESTADDRREQ;
1278
1279 fl6.fl6_dport = inet->inet_dport;
1280 daddr = &sk->sk_v6_daddr;
1281 fl6.flowlabel = np->flow_label;
1282 connected = 1;
1283 }
1284
1285 if (!fl6.flowi6_oif)
1286 fl6.flowi6_oif = sk->sk_bound_dev_if;
1287
1288 if (!fl6.flowi6_oif)
1289 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1290
1291 fl6.flowi6_mark = sk->sk_mark;
1292
1293 if (msg->msg_controllen) {
1294 opt = &opt_space;
1295 memset(opt, 0, sizeof(struct ipv6_txoptions));
1296 opt->tot_len = sizeof(*opt);
1297
1298 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1299 &hlimit, &tclass, &dontfrag);
1300 if (err < 0) {
1301 fl6_sock_release(flowlabel);
1302 return err;
1303 }
1304 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1305 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1306 if (!flowlabel)
1307 return -EINVAL;
1308 }
1309 if (!(opt->opt_nflen|opt->opt_flen))
1310 opt = NULL;
1311 connected = 0;
1312 }
1313 if (!opt) {
1314 opt = txopt_get(np);
1315 opt_to_free = opt;
1316 }
1317 if (flowlabel)
1318 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1319 opt = ipv6_fixup_options(&opt_space, opt);
1320
1321 fl6.flowi6_proto = sk->sk_protocol;
1322 if (!ipv6_addr_any(daddr))
1323 fl6.daddr = *daddr;
1324 else
1325 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1326 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1327 fl6.saddr = np->saddr;
1328 fl6.fl6_sport = inet->inet_sport;
1329
1330 final_p = fl6_update_dst(&fl6, opt, &final);
1331 if (final_p)
1332 connected = 0;
1333
1334 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1335 fl6.flowi6_oif = np->mcast_oif;
1336 connected = 0;
1337 } else if (!fl6.flowi6_oif)
1338 fl6.flowi6_oif = np->ucast_oif;
1339
1340 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1341
1342 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1343 if (IS_ERR(dst)) {
1344 err = PTR_ERR(dst);
1345 dst = NULL;
1346 goto out;
1347 }
1348
1349 if (hlimit < 0)
1350 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1351
1352 if (tclass < 0)
1353 tclass = np->tclass;
1354
1355 if (msg->msg_flags&MSG_CONFIRM)
1356 goto do_confirm;
1357 back_from_confirm:
1358
1359 /* Lockless fast path for the non-corking case */
1360 if (!corkreq) {
1361 struct sk_buff *skb;
1362
1363 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1364 sizeof(struct udphdr), hlimit, tclass, opt,
1365 &fl6, (struct rt6_info *)dst,
1366 msg->msg_flags, dontfrag);
1367 err = PTR_ERR(skb);
1368 if (!IS_ERR_OR_NULL(skb))
1369 err = udp_v6_send_skb(skb, &fl6);
1370 goto release_dst;
1371 }
1372
1373 lock_sock(sk);
1374 if (unlikely(up->pending)) {
1375 /* The socket is already corked while preparing it. */
1376 /* ... which is an evident application bug. --ANK */
1377 release_sock(sk);
1378
1379 net_dbg_ratelimited("udp cork app bug 2\n");
1380 err = -EINVAL;
1381 goto out;
1382 }
1383
1384 up->pending = AF_INET6;
1385
1386 do_append_data:
1387 if (dontfrag < 0)
1388 dontfrag = np->dontfrag;
1389 up->len += ulen;
1390 err = ip6_append_data(sk, getfrag, msg, ulen,
1391 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1392 (struct rt6_info *)dst,
1393 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1394 if (err)
1395 udp_v6_flush_pending_frames(sk);
1396 else if (!corkreq)
1397 err = udp_v6_push_pending_frames(sk);
1398 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1399 up->pending = 0;
1400
1401 if (err > 0)
1402 err = np->recverr ? net_xmit_errno(err) : 0;
1403 release_sock(sk);
1404
1405 release_dst:
1406 if (dst) {
1407 if (connected) {
1408 ip6_dst_store(sk, dst,
1409 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1410 &sk->sk_v6_daddr : NULL,
1411 #ifdef CONFIG_IPV6_SUBTREES
1412 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1413 &np->saddr :
1414 #endif
1415 NULL);
1416 } else {
1417 dst_release(dst);
1418 }
1419 dst = NULL;
1420 }
1421
1422 out:
1423 dst_release(dst);
1424 fl6_sock_release(flowlabel);
1425 txopt_put(opt_to_free);
1426 if (!err)
1427 return len;
1428 /*
1429 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1430 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1431 * we don't have a good statistic (IpOutDiscards but it can be too many
1432 * things). We could add another new stat but at least for now that
1433 * seems like overkill.
1434 */
1435 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1436 UDP6_INC_STATS_USER(sock_net(sk),
1437 UDP_MIB_SNDBUFERRORS, is_udplite);
1438 }
1439 return err;
1440
1441 do_confirm:
1442 dst_confirm(dst);
1443 if (!(msg->msg_flags&MSG_PROBE) || len)
1444 goto back_from_confirm;
1445 err = 0;
1446 goto out;
1447 }
1448
1449 void udpv6_destroy_sock(struct sock *sk)
1450 {
1451 struct udp_sock *up = udp_sk(sk);
1452 lock_sock(sk);
1453 udp_v6_flush_pending_frames(sk);
1454 release_sock(sk);
1455
1456 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1457 void (*encap_destroy)(struct sock *sk);
1458 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1459 if (encap_destroy)
1460 encap_destroy(sk);
1461 }
1462
1463 inet6_destroy_sock(sk);
1464 }
1465
1466 /*
1467 * Socket option code for UDP
1468 */
1469 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1470 char __user *optval, unsigned int optlen)
1471 {
1472 if (level == SOL_UDP || level == SOL_UDPLITE)
1473 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1474 udp_v6_push_pending_frames);
1475 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1476 }
1477
1478 #ifdef CONFIG_COMPAT
1479 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1480 char __user *optval, unsigned int optlen)
1481 {
1482 if (level == SOL_UDP || level == SOL_UDPLITE)
1483 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1484 udp_v6_push_pending_frames);
1485 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1486 }
1487 #endif
1488
1489 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1490 char __user *optval, int __user *optlen)
1491 {
1492 if (level == SOL_UDP || level == SOL_UDPLITE)
1493 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1494 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1495 }
1496
1497 #ifdef CONFIG_COMPAT
1498 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1499 char __user *optval, int __user *optlen)
1500 {
1501 if (level == SOL_UDP || level == SOL_UDPLITE)
1502 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1503 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1504 }
1505 #endif
1506
1507 static const struct inet6_protocol udpv6_protocol = {
1508 .handler = udpv6_rcv,
1509 .err_handler = udpv6_err,
1510 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1511 };
1512
1513 /* ------------------------------------------------------------------------ */
1514 #ifdef CONFIG_PROC_FS
1515 int udp6_seq_show(struct seq_file *seq, void *v)
1516 {
1517 if (v == SEQ_START_TOKEN) {
1518 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1519 } else {
1520 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1521 struct inet_sock *inet = inet_sk(v);
1522 __u16 srcp = ntohs(inet->inet_sport);
1523 __u16 destp = ntohs(inet->inet_dport);
1524 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1525 }
1526 return 0;
1527 }
1528
1529 static const struct file_operations udp6_afinfo_seq_fops = {
1530 .owner = THIS_MODULE,
1531 .open = udp_seq_open,
1532 .read = seq_read,
1533 .llseek = seq_lseek,
1534 .release = seq_release_net
1535 };
1536
1537 static struct udp_seq_afinfo udp6_seq_afinfo = {
1538 .name = "udp6",
1539 .family = AF_INET6,
1540 .udp_table = &udp_table,
1541 .seq_fops = &udp6_afinfo_seq_fops,
1542 .seq_ops = {
1543 .show = udp6_seq_show,
1544 },
1545 };
1546
1547 int __net_init udp6_proc_init(struct net *net)
1548 {
1549 return udp_proc_register(net, &udp6_seq_afinfo);
1550 }
1551
1552 void udp6_proc_exit(struct net *net)
1553 {
1554 udp_proc_unregister(net, &udp6_seq_afinfo);
1555 }
1556 #endif /* CONFIG_PROC_FS */
1557
1558 void udp_v6_clear_sk(struct sock *sk, int size)
1559 {
1560 struct inet_sock *inet = inet_sk(sk);
1561
1562 /* we do not want to clear pinet6 field, because of RCU lookups */
1563 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1564
1565 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1566 memset(&inet->pinet6 + 1, 0, size);
1567 }
1568
1569 /* ------------------------------------------------------------------------ */
1570
1571 struct proto udpv6_prot = {
1572 .name = "UDPv6",
1573 .owner = THIS_MODULE,
1574 .close = udp_lib_close,
1575 .connect = ip6_datagram_connect,
1576 .disconnect = udp_disconnect,
1577 .ioctl = udp_ioctl,
1578 .destroy = udpv6_destroy_sock,
1579 .setsockopt = udpv6_setsockopt,
1580 .getsockopt = udpv6_getsockopt,
1581 .sendmsg = udpv6_sendmsg,
1582 .recvmsg = udpv6_recvmsg,
1583 .backlog_rcv = __udpv6_queue_rcv_skb,
1584 .hash = udp_lib_hash,
1585 .unhash = udp_lib_unhash,
1586 .rehash = udp_v6_rehash,
1587 .get_port = udp_v6_get_port,
1588 .memory_allocated = &udp_memory_allocated,
1589 .sysctl_mem = sysctl_udp_mem,
1590 .sysctl_wmem = &sysctl_udp_wmem_min,
1591 .sysctl_rmem = &sysctl_udp_rmem_min,
1592 .obj_size = sizeof(struct udp6_sock),
1593 .slab_flags = SLAB_DESTROY_BY_RCU,
1594 .h.udp_table = &udp_table,
1595 #ifdef CONFIG_COMPAT
1596 .compat_setsockopt = compat_udpv6_setsockopt,
1597 .compat_getsockopt = compat_udpv6_getsockopt,
1598 #endif
1599 .clear_sk = udp_v6_clear_sk,
1600 };
1601
1602 static struct inet_protosw udpv6_protosw = {
1603 .type = SOCK_DGRAM,
1604 .protocol = IPPROTO_UDP,
1605 .prot = &udpv6_prot,
1606 .ops = &inet6_dgram_ops,
1607 .flags = INET_PROTOSW_PERMANENT,
1608 };
1609
1610 int __init udpv6_init(void)
1611 {
1612 int ret;
1613
1614 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1615 if (ret)
1616 goto out;
1617
1618 ret = inet6_register_protosw(&udpv6_protosw);
1619 if (ret)
1620 goto out_udpv6_protocol;
1621 out:
1622 return ret;
1623
1624 out_udpv6_protocol:
1625 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1626 goto out;
1627 }
1628
1629 void udpv6_exit(void)
1630 {
1631 inet6_unregister_protosw(&udpv6_protosw);
1632 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1633 }
Linux kernel - Deliverables
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